Unfortunately, the Outlook App for iOS does not support HTML email signatures. Please only use this guide if you’re planning to add a text-based email signature.
Open the Outlook App on your iPhone/iPad. Tap the menu button from the top left.
Tap the settings gear icon on the bottom left of the menu.
When you’re in the settings menu, tap on the signature section.
Press and hold over the email signature area, paste your new signature.
Your email signature is now installed!